When I went into downtown Osaka I would sometimes hang out at what the locals call Triangle park in Amemura. There are hardly any public benches in Japanese cities so the park is one of the only places downtown where you can sit down. When people meet up in the city, they often meet here. Many performers and skateboarders also gather here to practice their craft. The last time I went to Triangle park, this guy was practicing something though I couldn't figure out what. He was holding a fan and attempting to balance on something wrapped in a plastic bag. I asked a Japanese women sitting next to me watching the man what he was doing and she said she had no idea.
There are many characters in a big city like Osaka.